package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {

        //1.获取数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//获取签名并向下转型为方法签名
        Method method = signature.getMethod();//获取方法对象
        AutoFill autoFill = method.getAnnotation(AutoFill.class);//获取注解类型
        OperationType operationType = autoFill.value();//获取操作类型

        //2.获取参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];//获得参数对象

        //3.利用反射为参数赋值
        if(operationType == OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setCreateTime.invoke(entity,LocalDateTime.now());
                setCreateUser.invoke(entity,BaseContext.getCurrentId());
                setUpdateTime.invoke(entity,LocalDateTime.now());
                setUpdateUser.invoke(entity,BaseContext.getCurrentId());
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateTime.invoke(entity,LocalDateTime.now());
                setUpdateUser.invoke(entity,BaseContext.getCurrentId());
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
